Unit UT57 Bedienungsanleitung

Table of Contents

A. Your Meter’s Feature

B. Specifications

C. Making Measurements

D. Maintenance

E. Accessories

F. Using Holster

G. Using Strap

Introduction

UT57 is one type of UNI-T brand new UT50 series

Multimeters with 4 1/2 digits, which has special

and steady function and is a highly reliable hand

-held measuring instrument. The design of the

Meter is the use of CMOS technology with large

scale of integrated circuit using double integrated

A/D tranducer as its core and has full ranges overload

protection.The Meter can measure DC current,

AC current, DC Voltage, AC Voltage, Resistance,

Capacitance, Diode, Frequency and Continuity

Beeper. AC Voltage and Current measurement

is TRMS and has the function of AC+DC/AC which

is an ideal tool for users.

Model UT57: OPERATING MANUAL

Safety Rules

l Use the Meter only as specified in this

manual, otherwise the protection provided

by the Meter may be impaired.

l The meter is designed to withstand the

stated Max. voltages. If it is not possible

to exclude without doubts that impulses,

transients,disturbance or for other reasons,

these voltages are exceeded a suitable

prescale (10:1) must be used.

l Do not operate the Meter before the cabinet

has been closed and screwed safely as

terminal can carry voltage.

l Make sure the Meter is set to the suitable

range before each measurement.

l Before using the Meter, please inspect the

case and test leads for damaged insulation

or exposed metal.

l Connect the red and black test lead to the

correct measuring input jack properly.

l Do not input values over the maximum

range of each measurement to avoid

damages of the Meter.

l Do not turn the rotary function switch

during Voltage or Current measurement,

otherwise the Meter could be destroyed

Model UT57: OPERATING MANUAL

l Make sure to use new fuses with proper

rating to instead of bad fuses.

l To avoid electric shock or damages, do not

apply more than 1000V between the “COM”

terminals and “ ”earth ground.

l Use caution when working with Voltages

above 60V (DC) or 30Vrms (AC). These

Voltages pose shock hazard.

l Replace the battery as soon as the battery

indicator “ ”appears. With a low battery,

the Meter might produce false readings

that can lead to electric shock and personal

injury.

l Turn off the Meter once finished measuring.

l Do not operate the Meter under adverse

environmental condition including high

temperature and especially humid area as

the Meter's function may be effected after

moisturizing.

l To avoid damages and dangers, do not

change the circuit.

l Periodically wipe the cabinet with a damp

cloth and mid detergent. Do not use

abrasives or solvents.

l International Electrical Symbols:

Low Battery Earth Ground

Warning Double Insulated

AC Diode

Dangerous Voltages

DC Buzzer

Fuse

Model UT57: OPERATING MANUAL

A. Your Meter’s Feature

l 21 ranges.

l Liquid Crystal Display, digit’s height is

21mm .

l Overload display “l”.

l Maximum display “19999”.

l Full range symbol display.

l Full range overload protection.

l Auto-Power Off.

l Operating Temperature:

0oC to 40oC (32 oF to 104 oF ) .

l Storing Temperature:

-10oC to 50oC (14 oF to 122 oF) .

l Altitude:Operation:2000m.

Storage:10000m.

l Relative humidity:Max.relative humidity 80%

for temperature up to 31oC decreasing.

linearly to 50% relative humidity at 40oC.

l Low Battery display“ ”

l Battery type:9V Zinc,NEDA1604 or 6F22

or 006P.

l Fuse:F.0.3A/250Vφ5x20mm.

F.10A/250Vφ6x25mm.

l Measuring Dangerous Voltage display“ ”

l Strap for easy carry.

l Dimension: 190 x 88 x 34mm.

l Weight: about 270gram (excluding test

leads).

Model UT57: OPERATING MANUAL

B. Specifications

Accuracy is specified for one year after

calibration,at operating temeratures 23oC

5oC,with relative humidity at<75%.Accuracy

specifications take the form of: (a% readings

+n digits)

B-1 Direct Current Voltage (DC Voltage)

B-2 Alternate Current Voltage (AC Voltage)

200mV

20V

200V

750V

10µV

100µV

1mV

10mV

100mV

Range Resolution

(0.8% +20)

Accuracy

(1.0% +50)

Model UT57: OPERATING MANUAL

B-3 Direct Current Current (DC Current)

B-4 Alternate Current Current (AC Current)

Model UT57: OPERATING MANUAL

B-5 Resistance

200Ω

2KΩ

20KΩ

200KΩ

2MΩ

20MΩ

0.01Ω

0.1Ω

1Ω

10Ω

100Ω

1KΩ

Range Resolution Accuracy

(0.1% +2)

(0.1% +5)

(0.3% +10)

Overload protection: All ranges are 230VDC

or AC RMS.

Voltaeg at Open Circuit: About 3V

Caution: At 200Ωrange, short the test lead

first to obtain the resistance value of the test

leads. Deduct the resistance value from the

measured reading to obtain the correct value

of the object being measured .

B-6 Capacitance

20nF

200nF

2µF

20µF

1pF

10pF

0.1nF

1nf

Range Resolution Accuracy

(2.0% +10)

(2.5% +30)

Testing Signals: About 400Hz, 40mVrms.

Model UT57: OPERATING MANUAL

2-7 Frequency

Range Resolution Accuracy

20kHz 1Hz (1.0% +20)

200kHz 10Hz

Input sensitivity: 200mV rms,

Max Input Scope: 30V rms.

Overload protection: 230V rms

2-8 Diode and Continuity Beeper

Range Remark Measuring Condition

Display Diode

Forward Voltage

Value, unit is "V"

Forward DC Current abt

1mA, Backward DC

Voltage abt2.8V

Beeper sounds when

Resistance < 30Ω.

Display the nearest

value, unit is "kΩ"

Voltage at open Circuit

abt 3.0V

Overload protection: 230V DC orAC RMS.

Model UT57: OPERATING MANUAL

C. Making Measurements

Caution

(1) If there is no display or “ ” is shown on the

LCD when the Meter is switched on, replace

the battery ASAP.

(2) Never exceed the maximum input voltage or

current limits shown besides the input jacks

“ ” , otherwise the Meter's internal circuit will

be damaged and this is dangerous to life.

(3) Become familiar with all buttons,and Turn the

rotary switch to proper range before operating.

(4) Put the / On/Off button at “ ” position as

do not measure AC current or voltage,otherwise,

The LCD will appear “ AC ” symbol.

1. LCD Display

2. + / On/Off Button

3. / On/Off Button

4. Rotary Switch

5. COM Input Jack

6. Capacitance Jack

7. Power On/Off Button

8. Data-Hold Button

9. 200mA~10A lnput Jack

10. Below 200mA Input Jack

11. V Hz lnput Jack

Ω

Model UT57: OPERATING MANUAL

C-1 Measuring DC Voltage

1) / Button should not be pressed down

and LCD should not display “AC” Symbol.

2) Connect the black test lead to “COM” jack and

red test lead to “ V ” jack.

3) Set the rotary switch to “ V ”

4) Connect the test leads across with the object

to be measured. LCD appears the measuring

value and also the polarity of the red test leads.

Caution

1) If magnitude of the voltage is unknown, always

start with the highest range and reduce until

satisfactory reading is obtained.

2) If “1” is shown on the LCD, it means the Meter

is overloaded, then set the measuring range

to higher.

3) “ ” means never exceed the maximum input

limits, 1000V, otherwise internal circuit of the

Meter will be damaged even though it is still

possible to display higher voltage value.

4) Take extra care of voltage leakage when

measuring high voltage.

C-2 Measuring AC Voltage

1) Press down / button to display "AC" on

LCD. If + / button is not pressed, it

means the measuring value is the sum of

Direct and Alternate Current ( + ). While

if + / button is pressed, it means the

measuring value is a pure Alternate Current

TRMS.

Model UT57: OPERATING MANUAL

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